The Seismic Structure of Wilkes Land/Terre Adelie, East Antarctica and Comparison with Australia: First Steps in Reconstructing the Deep Lithosphere of Gondwana
A determination of the seismic structure of the crust and uppermost mantle of East Antarctica, in the region of Casey station, Wilkes Land and Dumont DUrville station, Terre Adelie is presented. High-fidelity waveforms from teleseismic earthquakes recorded at stations CASY and DRV (1996-2001) are us...
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Online Access: | https://eprints.utas.edu.au/1607/ https://eprints.utas.edu.au/1607/1/Reading_2004.pdf https://doi.org/10.1016/S1342-937X(05)70303-8 |
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ftunivtasmania:oai:eprints.utas.edu.au:1607 2023-05-15T13:36:46+02:00 The Seismic Structure of Wilkes Land/Terre Adelie, East Antarctica and Comparison with Australia: First Steps in Reconstructing the Deep Lithosphere of Gondwana Reading, AM 2004 application/pdf https://eprints.utas.edu.au/1607/ https://eprints.utas.edu.au/1607/1/Reading_2004.pdf https://doi.org/10.1016/S1342-937X(05)70303-8 en eng https://eprints.utas.edu.au/1607/1/Reading_2004.pdf Reading, AM orcid:0000-0002-9316-7605 2004 , 'The Seismic Structure of Wilkes Land/Terre Adelie, East Antarctica and Comparison with Australia: First Steps in Reconstructing the Deep Lithosphere of Gondwana' , Gondwana Research, vol. 7, no. 1 , pp. 21-30 , doi:10.1016/S1342-937X(05)70303-8 <http://dx.doi.org/10.1016/S1342-937X(05)70303-8>. cc_utas 260200 Geophysics 260100 Geology Seismic structure receiver function East Antarctica Australia Gondwana Article PeerReviewed 2004 ftunivtasmania https://doi.org/10.1016/S1342-937X(05)70303-8 2020-05-30T07:15:17Z A determination of the seismic structure of the crust and uppermost mantle of East Antarctica, in the region of Casey station, Wilkes Land and Dumont DUrville station, Terre Adelie is presented. High-fidelity waveforms from teleseismic earthquakes recorded at stations CASY and DRV (1996-2001) are used to calculate the seismic receiver function, the signal produced as energy passes through layers in the seismic velocity structure under the receiving station. The receiver functions are stacked to improve the signal-to-noise ratio and then modelled using an inverse algorithm to find the structure that best fits the observed waveform at each station. Inferences are made regarding the tectonic structure,in particular, the crustal thickness and character of the seismic Moho. The crustal thickness under Casey Station is found to be 30 km (+/- 2 km) with a fairly sharp Moho, considerably less than Dumont D'Urville Station, where the crustal thickness is 42 km, and there IS a significant low velocity region in the deep crust. The structure of the Wilkes Land lithosphere is comparable to that of the Albany-Fraser Orogen, Western Australia, part of its conjugate margin. This places a new constraint on the relative position of East Antarctica and Australia in the reconstruction of Gondwana, and earlier, supercontinents. A recent reinterpretation of Antarctic geology proposes tectonic province boundaries trending perpendicular to the coast with counterparts in southern Australia. Seismic techniques, determining structure beneath regions with no surface exposure, are vital tools in testing such tectonic hypotheses, towards the reconstruction of Gondwana to full lithospheric depth. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Wilkes Land University of Tasmania: UTas ePrints Antarctic East Antarctica Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) Dumont d'Urville ENVELOPE(140.017,140.017,-66.667,-66.667) Dumont-d'Urville ENVELOPE(140.013,140.013,-66.667,-66.667) Casey Station ENVELOPE(110.528,110.528,-66.282,-66.282) Dumont d'Urville Station ENVELOPE(140.000,140.000,-66.667,-66.667) Casy ENVELOPE(-57.505,-57.505,-63.236,-63.236) Gondwana Research 7 1 21 30 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
English |
topic |
260200 Geophysics 260100 Geology Seismic structure receiver function East Antarctica Australia Gondwana |
spellingShingle |
260200 Geophysics 260100 Geology Seismic structure receiver function East Antarctica Australia Gondwana Reading, AM The Seismic Structure of Wilkes Land/Terre Adelie, East Antarctica and Comparison with Australia: First Steps in Reconstructing the Deep Lithosphere of Gondwana |
topic_facet |
260200 Geophysics 260100 Geology Seismic structure receiver function East Antarctica Australia Gondwana |
description |
A determination of the seismic structure of the crust and uppermost mantle of East Antarctica, in the region of Casey station, Wilkes Land and Dumont DUrville station, Terre Adelie is presented. High-fidelity waveforms from teleseismic earthquakes recorded at stations CASY and DRV (1996-2001) are used to calculate the seismic receiver function, the signal produced as energy passes through layers in the seismic velocity structure under the receiving station. The receiver functions are stacked to improve the signal-to-noise ratio and then modelled using an inverse algorithm to find the structure that best fits the observed waveform at each station. Inferences are made regarding the tectonic structure,in particular, the crustal thickness and character of the seismic Moho. The crustal thickness under Casey Station is found to be 30 km (+/- 2 km) with a fairly sharp Moho, considerably less than Dumont D'Urville Station, where the crustal thickness is 42 km, and there IS a significant low velocity region in the deep crust. The structure of the Wilkes Land lithosphere is comparable to that of the Albany-Fraser Orogen, Western Australia, part of its conjugate margin. This places a new constraint on the relative position of East Antarctica and Australia in the reconstruction of Gondwana, and earlier, supercontinents. A recent reinterpretation of Antarctic geology proposes tectonic province boundaries trending perpendicular to the coast with counterparts in southern Australia. Seismic techniques, determining structure beneath regions with no surface exposure, are vital tools in testing such tectonic hypotheses, towards the reconstruction of Gondwana to full lithospheric depth. |
format |
Article in Journal/Newspaper |
author |
Reading, AM |
author_facet |
Reading, AM |
author_sort |
Reading, AM |
title |
The Seismic Structure of Wilkes Land/Terre Adelie, East Antarctica and Comparison with Australia: First Steps in Reconstructing the Deep Lithosphere of Gondwana |
title_short |
The Seismic Structure of Wilkes Land/Terre Adelie, East Antarctica and Comparison with Australia: First Steps in Reconstructing the Deep Lithosphere of Gondwana |
title_full |
The Seismic Structure of Wilkes Land/Terre Adelie, East Antarctica and Comparison with Australia: First Steps in Reconstructing the Deep Lithosphere of Gondwana |
title_fullStr |
The Seismic Structure of Wilkes Land/Terre Adelie, East Antarctica and Comparison with Australia: First Steps in Reconstructing the Deep Lithosphere of Gondwana |
title_full_unstemmed |
The Seismic Structure of Wilkes Land/Terre Adelie, East Antarctica and Comparison with Australia: First Steps in Reconstructing the Deep Lithosphere of Gondwana |
title_sort |
seismic structure of wilkes land/terre adelie, east antarctica and comparison with australia: first steps in reconstructing the deep lithosphere of gondwana |
publishDate |
2004 |
url |
https://eprints.utas.edu.au/1607/ https://eprints.utas.edu.au/1607/1/Reading_2004.pdf https://doi.org/10.1016/S1342-937X(05)70303-8 |
long_lat |
ENVELOPE(120.000,120.000,-69.000,-69.000) ENVELOPE(140.017,140.017,-66.667,-66.667) ENVELOPE(140.013,140.013,-66.667,-66.667) ENVELOPE(110.528,110.528,-66.282,-66.282) ENVELOPE(140.000,140.000,-66.667,-66.667) ENVELOPE(-57.505,-57.505,-63.236,-63.236) |
geographic |
Antarctic East Antarctica Wilkes Land Dumont d'Urville Dumont-d'Urville Casey Station Dumont d'Urville Station Casy |
geographic_facet |
Antarctic East Antarctica Wilkes Land Dumont d'Urville Dumont-d'Urville Casey Station Dumont d'Urville Station Casy |
genre |
Antarc* Antarctic Antarctica East Antarctica Wilkes Land |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Wilkes Land |
op_relation |
https://eprints.utas.edu.au/1607/1/Reading_2004.pdf Reading, AM orcid:0000-0002-9316-7605 2004 , 'The Seismic Structure of Wilkes Land/Terre Adelie, East Antarctica and Comparison with Australia: First Steps in Reconstructing the Deep Lithosphere of Gondwana' , Gondwana Research, vol. 7, no. 1 , pp. 21-30 , doi:10.1016/S1342-937X(05)70303-8 <http://dx.doi.org/10.1016/S1342-937X(05)70303-8>. |
op_rights |
cc_utas |
op_doi |
https://doi.org/10.1016/S1342-937X(05)70303-8 |
container_title |
Gondwana Research |
container_volume |
7 |
container_issue |
1 |
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21 |
op_container_end_page |
30 |
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1766083602654691328 |